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Definition of term - mafic granulite (A proposal on behalf of the IUGS Subcommision on the Systematics of Metamorphic Rocks,(Web version of 31.10.2002) (A proposal on behalf of the IUGS Subcommision on the Systematics of Metamorphic Rocks,(Web version of 31.10.2002) Granulite is a high-grade metamorphic rock in which Fe- Mg-silikates are dominantly hydroxil- free.... The basis of the rocks names is their mineralogy and structure. The basis of the rocks names is their mineralogy and structure. The rocks with >30% mafic mineral may be called mafic granulites. The rocks with >30% mafic mineral may be called mafic granulites. The term should not be applied to calcsilicate rocks, marbl, ironstones and quartzites. The term should not be applied to calcsilicate rocks, marbl, ironstones and quartzites.

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Whole rock compositions, with well defined positive Eu anomalies indicate that protoliths of mafic granulites from Bistrica have a cumulus origin. PROTOLITH Distinguishing oceanic plateau basalts from MORB is more difficult, because all geochemically gradations exist between these basalts. The trace element, rare earth element data suggest that Mafic granulites of Bistrica have protolith features resembling mid-ocean ridge basalt (MORB). The low silica content could be due to loss of a silicic melt (or fluid) during subduction, or loss of SiO2 during seafloor alteration Partial melting or dehydration of the subducted oceanic crust causes loss of LREE Mafic granulites could represent deep cumulus portions of subducted oceanic crust (olivine gabbros ?) Lack of sheeted dyke complexes in investigated area may suggest also an oceanic plateau (ophiolites formed in back arc basins?) CONCLUSIONS

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Metamorphic changes are most probably related with subduction off oceanic crust (basaltic rocks) during formation of Dinaridic ophiolite belt in Jurassic (?) Metamorphic changes are most probably related with subduction off oceanic crust (basaltic rocks) during formation of Dinaridic ophiolite belt in Jurassic (?) CONCLUSIONS